, 170 pages In this study, we consider learning preference structure of a Decision Maker (DM). Many preference modeling problems in a variety of fields such as marketing, quality control and economics, involve possibly interacting criteria, and an ordinal scale is used to express preference of objects. In these cases, typically underlying preference structure of the DM and distribution of criteria values are not known, At the end, I am deeply grateful to my wife Serap Şen Erişkin for her endless support and love. Without her, it would have been impossible to finish my Ph.D. studies. I would like to thank her and our children Öykü and Ozan for making my life a better one. xi TABLE OF CONTENTS